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Those signs are not a good sign. From what you have posted, I would say your amp is toast. Check to make sure your subs aren't blown. Hook up a separate speaker to each channel to make sure it isn't your subs. Check your RCAs to make sure you don't have a nick in them some where. Just get any pair of RCA's that you know are good and run them directly from the head unit to the amp. Good luck.
-Andrew Hawkins